Ho-Kwang Mao
Born (1941-06-18) June 18, 1941
Shanghai, China
Alma mater1963 B.S. National Taiwan University

1966 M.S. University of Rochester

1968 Ph.D University of Rochester
Known forHigh Pressure techniques, X-ray sciences
SpouseAgnes Mao
AwardsInge Lehmann Medal (2007)

Balzan Prize (2005)
Gregori Aminoff Prize (2005)
Roebling Medal (2005)
Arthur L. Day Prize (1990)
P. W. Bridgman Award (1989)

Mineralogical Society of America Award (1979)
Scientific career
FieldsGeology, Material Sciences
InstitutionsCarnegie Institution of Washington
Doctoral advisorBill Bassett and Taro Takahashi [1]
Websitehttps://sites.google.com/carnegiescience.edu/ho-kwangmao/cv

Ho-Kwang (Dave) Mao (Chinese: 毛河光; pinyin: Máo Héguāng; Wade–Giles: Mao Ho-kuang; born June 18, 1941) is a Chinese-American geologist. He is the director of the Center for High Pressure Science and Technology Advanced Research in Shanghai, China.[2] He was a staff scientist at Geophysical Laboratory of the Carnegie Institution for Science[3] for more than 30 years. Mao is a recognized leading scientist in high pressure geosciences and physical science. There are two minerals named after him, Davemaoite and Maohokite.

Biography

Mao was born in Shanghai in 1941. His father, General Mao Sen (毛森), was a high-ranking official of the intelligence department of the Republic of China. When Mao was seven years old, he moved to Taiwan with his family, fleeing with the rest of the government of the Republic of China to the province.[4][5] Mao received his BS from National Taiwan University in 1963. Mao further pursued his studies in the United States, and obtained MS in 1966 and PhD in 1968 from the University of Rochester, New York.

From 1968 to 1972, Mao did his postdoctoral research at the Geophysical Laboratory of the Carnegie Institution of Washington (CIW). From then on Mao has spent his career at Geophysical Laboratory as a Senior Staff scientist.

In 2013, Mao founded Center for High Pressure Science and Technology Advanced Research in his birthplace, Shanghai.[2][6] He takes the director role at the center and leads a group of international scientists to tackle world-class scientific challenges.[6] The center has a Nature index of 17.68 in 2021 and was on an increasing trend since 2016.[7]

Mao has three daughters - Cyndy, Linda, and Wendy. His youngest daughter, Wendy Mao, is a professor of geological sciences at Stanford University.[8]

Research

Achieving high pressure and pressure calibration methods

Mao is one of the most prolific users of the diamond anvil cell for research at high pressures. Although at the time the claim was controversial,[9] his work with Peter M. Bell is now generally accepted as being the first verified static pressure in excess of 1 Megabar.[10][11]

Mao and colleagues first calibrated ruby fluorescence pressure scale to 80 GPa and this method has been widely used in almost every diamond anvil cell experiments.[12] This work has been cited by 3921 times as of Jan 15, 2022, according to google scholar.

In 2018, 400 GPa was achieved by his team and a detailed description of pressure loading and distribution, gasket thickness variation, and diamond anvil deformation was reported.[13][14]

Towards metallic hydrogen

Mao is a pioneer in experimentally exploring the possible metallic hydrogen phase under high pressure. His work on solid hydrogen starts in 1988, where he reported single-crystal structure of hydrogen up to 26.5 GPa.[15] He later published a review paper on transitions in solid hydrogen in 1994.[16] In 1996, his team's work[17] suggested a more compressible solid hydrogen than previously thought. More recently in 2019, his team published results on single crystal diffraction of the lightest material in the world, hydrogen, up to 254 GPa and revealed isostructural electronic transitions in solid hydrogen at around 220 GPa.[18]

Superconductivity

In 1987, Mao and a colleague at the Geophysical Laboratory, Robert Hazen, identified the composition and structure of the first high-temperature superconductor to have a critical temperature above the boiling point of liquid nitrogen.[19]

Iron peroxide in Earth's interior

Mao discovered formation of FeO2Hx from goethite FeOOH[20] or from iron-water reaction[21] under Earth's lower mantle conditions. The novel FeO2Hx phase processes a pyrite structure. Since this phase can contain varied amount of hydrogen,[22] it would have important implications for the deep water cycle.[23][24]

Honors and awards

References

  1. ↑ "Ho-Kwang Mao |". honors.agu.org. Retrieved 2022-01-14.
  2. 1 2 Mao, Ho-kwang (July 2016). "High pressure presses ahead". Nature Materials. 15 (7): 694–695. Bibcode:2016NatMa..15..694M. doi:10.1038/nmat4642. ISSN 1476-4660. PMID 27329457. S2CID 44666542.
  3. 1 2 Witze, Alexandra (11 November 2021). "Diamond delivers long-sought mineral from the deep Earth". Nature. doi:10.1038/d41586-021-03409-2. PMID 34764468. S2CID 244039394.
  4. ↑ Li, Wei (2010). 折戟沉沙: 英雄無淚 (in Chinese). 秀威資訊科技股份有限公司. pp. 236–237. ISBN 9789862214282.
  5. ↑ "军统特务毛森简历 毛森的后代". ishare.ifeng.com (in Chinese). Retrieved 2022-01-14.
  6. 1 2 O’Meara, Sarah (March 2019). "Materials science is helping to transform China into a high-tech economy". Nature. 567 (7748): S1–S5. Bibcode:2019Natur.567S...1O. doi:10.1038/d41586-019-00885-5. ISSN 0028-0836. PMID 30894738. S2CID 84186042.
  7. ↑ "Center for High Pressure Science and Technology Advanced Research (HPSTAR)". Nature Index. Retrieved 2022-01-14.
  8. ↑ "Ho-Kwang Mao |". honors.agu.org. Retrieved 2022-01-14.
  9. ↑ Bassett, William A. (2009-06-01). "Diamond anvil cell, 50th birthday". High Pressure Research. 29 (2): 163–186. Bibcode:2009HPR....29..163B. doi:10.1080/08957950802597239. ISSN 0895-7959. S2CID 15204168.
  10. ↑ Hazen, Robert M. (1999). The diamond makers (Rev. ed.). New York: Cambridge University Press. ISBN 0521654742.
  11. ↑ Mao, H. K.; Bell, P. M. (27 February 1976). "High-Pressure Physics: The 1-Megabar Mark on the Ruby R 1 Static Pressure Scale". Science. 191 (4229): 851–852. Bibcode:1976Sci...191..851M. doi:10.1126/science.191.4229.851. PMID 17730998. S2CID 12416002.
  12. ↑ Mao, H. K.; Xu, J.; Bell, P. M. (1986). "Calibration of the ruby pressure gauge to 800 kbar under quasi-hydrostatic conditions". Journal of Geophysical Research. 91 (B5): 4673. Bibcode:1986JGR....91.4673M. doi:10.1029/jb091ib05p04673. ISSN 0148-0227.
  13. ↑ Li, Bing; Ji, Cheng; Yang, Wenge; Wang, Junyue; Yang, Ke; Xu, Ruqing; Liu, Wenjun; Cai, Zhonghou; Chen, Jiuhua; Mao, Ho-kwang (2018-02-05). "Diamond anvil cell behavior up to 4 Mbar". Proceedings of the National Academy of Sciences. 115 (8): 1713–1717. Bibcode:2018PNAS..115.1713L. doi:10.1073/pnas.1721425115. ISSN 0027-8424. PMC 5828636. PMID 29432145.
  14. ↑ "How a diamond anvil cell works up to 4 Mbar". Geophysical Laboratory. 2018-02-13. Retrieved 2022-01-15.
  15. ↑ Mao, H. K.; Jephcoat, A. P.; Hemley, R. J.; Finger, L. W.; Zha, C. S.; Hazen, R. M.; Cox, D. E. (1988). "Synchrotron X-ray Diffraction Measurements of Single-Crystal Hydrogen to 26.5 Gigapascals". Science. 239 (4844): 1131–1134. Bibcode:1988Sci...239.1131M. doi:10.1126/science.239.4844.1131. ISSN 0036-8075. JSTOR 1700584. PMID 17791973. S2CID 28007172.
  16. ↑ Mao, Ho-kwang; Hemley, Russell J. (1994-04-01). "Ultrahigh-pressure transitions in solid hydrogen". Reviews of Modern Physics. 66 (2): 671–692. Bibcode:1994RvMP...66..671M. doi:10.1103/revmodphys.66.671. ISSN 0034-6861.
  17. ↑ Loubeyre, P.; LeToullec, R.; Hausermann, D.; Hanfland, M.; Hemley, R. J.; Mao, H. K.; Finger, L. W. (Oct 1996). "X-ray diffraction and equation of state of hydrogen at megabar pressures". Nature. 383 (6602): 702–704. Bibcode:1996Natur.383..702L. doi:10.1038/383702a0. ISSN 0028-0836. S2CID 4372789.
  18. ↑ Ji, Cheng; Li, Bing; Liu, Wenjun; Smith, Jesse S.; Majumdar, Arnab; Luo, Wei; Ahuja, Rajeev; Shu, Jinfu; Wang, Junyue; Sinogeikin, Stanislav; Meng, Yue (2019-09-25). "Ultrahigh-pressure isostructural electronic transitions in hydrogen". Nature. 573 (7775): 558–562. Bibcode:2019Natur.573..558J. doi:10.1038/s41586-019-1565-9. ISSN 0028-0836. OSTI 1567058. PMID 31554980. S2CID 202762596.
  19. ↑ Chu, C. W. (January 2011). "Materials: Cuprates—Superconductors with a Tc up to 164 K". In Rogalla, Horst; Kes, Peter H. (eds.). 100 Years of Superconductivity. CRC Press. pp. 244–255. doi:10.1201/b11312-8. ISBN 978-0-429-06586-6.
  20. ↑ Hu, Qingyang; Kim, Duck Young; Yang, Wenge; Yang, Liuxiang; Meng, Yue; Zhang, Li; Mao, Ho-Kwang (2016-06-08). "FeO2 and FeOOH under deep lower-mantle conditions and Earth's oxygen–hydrogen cycles". Nature. 534 (7606): 241–244. Bibcode:2016Natur.534..241H. doi:10.1038/nature18018. ISSN 0028-0836. PMID 27279220. S2CID 10702618.
  21. ↑ Liu, Jin; Hu, Qingyang; Young Kim, Duck; Wu, Zhongqing; Wang, Wenzhong; Xiao, Yuming; Chow, Paul; Meng, Yue; Prakapenka, Vitali B.; Mao, Ho-Kwang; Mao, Wendy L. (Nov 2017). "Hydrogen-bearing iron peroxide and the origin of ultralow-velocity zones". Nature. 551 (7681): 494–497. Bibcode:2017Natur.551..494L. doi:10.1038/nature24461. ISSN 0028-0836. OSTI 1423460. PMID 29168804. S2CID 4463870.
  22. ↑ Hu, Qingyang; Kim, Duck Young; Liu, Jin; Meng, Yue; Yang, Liuxiang; Zhang, Dongzhou; Mao, Wendy L.; Mao, Ho-kwang (2017-01-31). "Dehydrogenation of goethite in Earth's deep lower mantle". Proceedings of the National Academy of Sciences. 114 (7): 1498–1501. Bibcode:2017PNAS..114.1498H. doi:10.1073/pnas.1620644114. ISSN 0027-8424. PMC 5320987. PMID 28143928.
  23. ↑ Mao, Ho-Kwang; Hu, Qingyang; Yang, Liuxiang; Liu, Jin; Kim, Duck Young; Meng, Yue; Zhang, Li; Prakapenka, Vitali B; Yang, Wenge; Mao, Wendy L (2017-09-08). "When water meets iron at Earth's core–mantle boundary". National Science Review. 4 (6): 870–878. doi:10.1093/nsr/nwx109. ISSN 2095-5138.
  24. ↑ Four-Dimensional Model Assimilation of Data. 1991-01-01. doi:10.17226/1830. ISBN 978-0-309-04536-0.
  25. 1 2 "Ho-kwang Mao". www.nasonline.org. Retrieved 2022-01-14.
  26. ↑ Shao, Danlei (25 Dec 2020). "World-Renowned Scientist Ho-Kwang Mao joins Zhejiang University as Honorary Professor". Retrieved 14 Jan 2022.
  27. ↑ Prewitt, C. T. (1 May 2006). "Presentation of the Roebling Medal for 2005 of the Mineralogical Society of America to Ho-kwang Mao". American Mineralogist. 91 (5–6): 965–966. Bibcode:2006AmMin..91..965P. doi:10.2138/am.2006.459.
  28. ↑ Mao, H.-k. D. (1 May 2006). "Acceptance of the Mineralogical Society of America Roebling Medal for 2005". American Mineralogist. 91 (5–6): 967–968. Bibcode:2006AmMin..91..967M. doi:10.2138/am.2006.460.
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